Voters in seven states and Washington, D.C., will cast ballots Tuesday in the final big primary day before the November elections -- and the Tea Party is once again putting up a good fight.

Over the weekend, Tea Party activists protested across the nation, weighing in on the growing concern over big government.

In Sacramento, Calif., an estimated 4,000 people attended a local rally. Their message to the U.S. government was to lower taxes and repeal President Barack Obama's health care law.

"We're really wanting to get government out of our lives, to pay our bills and have fiscal responsibility in our nation," a Sacramento Tea Party member said.

Many candidates are aware of the voter anger and are trying to prove they are not part of the political establishment.

With control of the U.S. Senate possibly at stake in November, Tuesday's liveliest race may be in Delaware, in the GOP contest for the former seat of Vice President Joe Biden.

Congressman and former Gov. Mike Castle was the heavy favorite for months, but conservative Christine O'Donnell has recently moved up in voter polls.

"He voted with Barack Obama on every major bill this summer," O'Donnell said in an interview with CBN News. "So Republicans are frustrated with that. They're tired of having to hold their nose and push the button for Mike Castle because there's no alternative.

Delaware's GOP establishment doesn't want Castle to suffer the same fate as Alaska Sen. Lisa Murkowski, who lost to Tea Party favorite Joe Miller. They've called O'Donnell out for problems in her past with the IRS and for allegedly mismanaging funds.

"She left vendors and staff unpaid while using campaign funds to pay her own rent and personal expenses," one campaign ad claimed.

The Tea Party Express says the Castle campaign is guilty of smear tactics.

Tea Party influence is also being seen in the Republican Senate primary in New Hampshire, where top contenders include Kelly Ayotte and Ovid Lamontagne.

In Wisconsin, Democratic Sen. Russ Feingold is running neck and neck with Republican challenger Ron Johnson in the polls.

Atty. Gen. Andrew Cuomo is favored for the Democratic nod in New York's high profile governor's race, while former Senate candidate Rick Lazio is ahead for the GOP.

And in Massachusetts, incumbent Gov. Deval Patrick should emerge from the primaries in a tight three way race with Republican Charlie Baker and and independent Tim Cahill.